Is it possible to only enable the submit button when all fields are filled?

Rather than have each required field REQUIRED, is it possible to have the SUBMIT FORM button 'greyed out' until all form fields are completed?

I am still working on the website and form, so cannot provide a sample URL.  

Unfortunately, you can only make the submit button remain hidden until all fields are filled.

However, since, from what I understand, you will be embedding your form to your website, may I suggest you use the form's full source code and apply scripts to it to make the submit button only enabled when all fields are filled.

Related Articles:

http://stackoverflow.com/questions/5614399/disabling-submit-button-until-all-fields-have-values

http://stackoverflow.com/questions/27829051/enable-submit-button-only-when-all-fields-are-filled

Thank you.